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RECORD NUMBER: 27 OF 47

OLS Field Name OLS Field Data
Main Title Microbial degradation kinetics of toxic organic chemicals over a wide range of concentrations in natural aquatic systems /
Author Hwang, H. M. ; Hodson, R. E. ; Lewis, D. L.
Other Authors
Author Title of a Work
University of Georgia.
Hodson, Robert E.
Lewis, David L.
CORP Author Environmental Research Lab., Athens, GA. Office of Research and Development. ;Georgia Univ., Athens.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory,
Year Published 1989
Report Number EPA/600/J-89/052
Stock Number PB89-197511
Additional Subjects Decomposition reactions ; Organic compounds ; Aquatic microbiology ; Acetone ; Methanols ; Cresols ; Phenols ; Water pollution ; Lakes ; Reaction kinetics ; Industrial wastes ; Reprints ; Biodegradation ; Toxic substances ; Environmental persistence ; Chlorophenols ; Aquatic ecosystems ; Xenobiotics
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB89-197511 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation 12 pages ; 28 cm
Abstract
The degradation kinetics for several toxic organic compounds (p-cresol, phenol, p-chlorophenol, acetone, and methanol) exposed to natural aquatic microbial assemblages were examined over a wide range of concentrations. The results revealed that degradation kinetics were multiphasic for each of the compounds during at least one sampling period, i.e., the kinetic parameters K sub t and V sub max increased with increasing substrate concentration. The observed multiphasicity suggests the presence within the natural microbial assemblages of multiple uptake/degradative systems, each with distinguishable kinetic parameters and each dominating degradation at a different substrate concentration range. If the kinetic diversity is ignored and rates of degradation are calculated based on the assumption that kinetics follow simple hyperbolic (Michaelis-Menten) relationships, then errors as large as 40,000-fold can result. Thus, the results suggest that models for predicting the persistence of such compounds in natural waters should consider changes in kinetic constants with substrate concentration. (Copyright (c) 1989 SETAC.)
Notes
"Journal article." "EPA/600/J-89/052." "Published in Environmental Toxicology and Chemistry, 8(1):65-74, January 1989." Microfiche.